Hannover 2020 – scientific programme
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A: Fachverband Atomphysik
A 22: Poster Session - Atomic Physics III
A 22.14: Poster
Wednesday, March 11, 2020, 16:00–18:00, Empore Lichthof
Reconstructing the optical transfer function by absorption imaging of disordered atom distributions. — •David Grimshandl1, Carlos Brandl1, Titus Franz1, Sebastian Geier1, Clément Hainaut1, André Salzinger1, Annika Tebben1, Gerhard Zürn1, and Matthias Weidemüller1,2 — 1Physikalisches Institut, Universität Heidelberg, Im Neuenheimer Feld 226, 69120 Heidelberg, Germany — 2Shanghai Branch, University of Science and Technology of China, Shanghai 201315, China
Many cold atom experiments rely on absorption imaging as primary observation method. Here it is crucial to discriminate between the optical response of the imaged medium and the effects of the imaging apparatus. Common methods to retrieve the transfer function of an optical system require additional optics and instrumentation in the object plane which cannot be accessed in situ in most cold atom experiments. In our experiment with cold Rydberg atoms we employed a method to retrieve the wavefront error across the exit pupil and the coherent point spread function of the imaging apparatus from the spatial noise correlations in absorption images. This allows to evaluate the performance of the imaging system in situ and thus can be used to improve the optical system on-the-fly, e.g. by selectively cancelling aberrations from misalignment, defocus and tilts.